A coking coal blending regulation method for online preparation of high-quality coke

Abstract

The present application provides a kind of coking coal blending regulation method for preparing high-quality coke online, comprising coal blending coking, detecting active-inert ratio of blending coal, detecting G value or Y value of coking coal, high-temperature coking and coke quality detection and other steps. Gas coal, gas fat coal, coking coal, fat coal, 1 / 3 coking coal, lean coal, lean coking coal are mixed to form blending coal, the amount of binder or leaner agent is selected according to the active-inert ratio of blending coal, the G value and Y value of coking coal are detected, and further binder or leaner agent is added according to the detection result until the detection value meets the standard of entering the furnace, and finally high-temperature coking and coke quality detection are carried out, and the coke M 40 ≥82% and CSR≥60%, the production online regulation is completed.

Description

Technical Field

[0001] This invention relates to the field of coking coal blending technology, and more specifically to a method for controlling coking coal blending in the online preparation of high-quality coke. Background Technology

[0002] To effectively utilize coking coal resources, additives can be added to improve coke quality and reduce coking costs. Coal blending additives can be divided into two categories: binding additives, mainly including coal tar pitch, coal tar, and petroleum residues; and inert additives, including coke powder, anthracite, and inorganic inert substances. Coal petrology suggests that the best coke quality is achieved when the ratio of active to inert components in coal reaches its optimal level. Therefore, adding active components (binders) or inert components (leanizing agents) during coking can improve the binding and coking properties of coal, enhance coke quality, expand coking coal sources, make coal blending schemes more flexible, and ultimately address the problem of excessive reliance on high-quality coal resources in blast furnace ironmaking.

[0003] Adding binders to coke increases the amount of liquid phase within the plastic mass, improves its fluidity, and enhances the thermal conversion process of the mesophase within the plastic mass. Coke produced from coal with highly active binders exhibits a higher anisotropic content than coke produced from raw coal and binder alone. The liquid phase within the plastic mass not only increases in quantity but also exhibits a more uniform molecular weight distribution and longer residence time. This leads to an increase in the number of mesophase precursors within the plastic mass, improved orientation conditions, and a wider temperature range. Coke production with binders not only increases the amount of non-caking coal used and reduces production costs but also improves the cold and hot strength of the coke.

[0004] In the plastic stage of coking, the addition of leaning agents in coking processes is beneficial. Inert materials themselves have no binding properties and cannot produce colloids, but they can adsorb excess liquid phase to adjust the expansion and fluidity to a suitable range, improving the thermal stability of the coal. Simultaneously, due to their low shrinkage and good thermal conductivity, adding them to blended coal can reduce the shrinkage coefficient and the shrinkage difference between adjacent semi-coke layers, thereby reducing the rate of coke cracking and increasing coke lumps. A common characteristic of various leaning agents is their low volatile matter content. Adding an appropriate amount of leaning agent can reduce the semi-coke shrinkage coefficient of blended coal, improve the pore structure of semi-coke, increase semi-coke strength, and also reduce the shrinkage difference between adjacent semi-coke layers, reducing coke cracks and increasing coke strength. However, leaning agents have poor binding and coking properties and cannot be used as the main raw material for blended coking. However, they can be added in small amounts as leaning agents to improve coke strength and lumps.

[0005] However, most existing coal blending methods rely on experience. These methods involve conducting numerous experiments in experimental coke ovens, selecting the appropriate single type of coal based on the results. This traditional approach, coupled with the large number of experiments, inherent uncertainty, and lengthy blending time, necessitates a faster coal blending method. Therefore, a faster coal blending method is needed. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a method for controlling the online preparation of high-quality coke using coking coal blending. Starting from the perspective of the petrographic activity and inert components of coking coal blends, and combining a historical database of optimal active-inert ratios for coking coals, this invention subdivides the active-inert ratio ranges for coking coals. By incorporating the traditional Gibbs freeness (G) value and plastic layer thickness (Y) value of coking coal, a simplified and rapid coking coal blending method is proposed, simultaneously improving coke quality. Furthermore, the binders involved in this invention include tar pitch, petroleum pitch, and tar residue; the leaning agents include anthracite, coke powder, and petroleum coke. All of these components have lower costs than coking coal, and some additives are carbonaceous waste, thus achieving low-cost coking coal blending.

[0007] The technical means employed in this invention are as follows: A method for controlling the coking coal blending in online production of high-quality coke, characterized by comprising: (1) Coal blending: Multiple single coals, including gas coal, gas-fat coal, coking coal, fat coal, 1 / 3 coking coal, lean coal, and lean coking coal, are mixed to form blended coal. The proportion of gas coal or gas-fat coal is ≤25%, and the proportion of lean coal or lean coking coal is ≤25%. This is to ensure that the proportion of binder not exceeding 20% ​​and the proportion of leaning agent not exceeding 10% can be added later. (2) Detect the active-inert ratio of the blended coal, add binders or leaning agents according to the active-inert ratio to form coking coal, detect the Gibbs freeness G value or the thickness Y value of the plastic layer of the coking coal, and add binders or leaning agents according to the detected values; the active-inert ratio refers to the ratio of the active component to the inert component of the blended coal under a coal petrography microscope, wherein the active component is vitrinite + 1 / 3 half vitrinite, and the inert component is filamentous group + shell group + 2 / 3 half vitrinite + minerals; When the active-inert ratio is <4, a binder is added to the blended coal to obtain coking coal; specifically, when 2 ≤ active-inert ratio <4, less than 3% of the total material mass fraction of binder is added; when the active-inert ratio <2, 3%~20% of the total material mass fraction of binder is added; when G is 75~90 or Y is 13.5~28mm, the coking coal enters the coke oven for coking production; when G>90 or Y>28mm, a leanening agent is added to the coking coal until G is 7. 5~90 or Y value is 13.5~28mm; when G<75 or Y<13.5mm, continue to add binder until G is 75~90 or Y is 13.5~28mm, and when the binder mass is added to the maximum value of the above-mentioned limited range, if the G value is still less than 75 or the Y value is still less than 13.5mm, return to step (1) to adjust the blending ratio of coking coal and fat coal until the G of coking coal is 75~90 or Y is 13.5~28mm; When the active-inert ratio is ≥4, a leaning agent is added to the blended coal to obtain coking coal; specifically, when 4≤active-inert ratio≤6, a leaning agent of less than 3% of the total material mass fraction is added; when the active-inert ratio>6, a leaning agent of 3%~10% of the total material mass fraction is added; when G is 75~90 or Y is 13.5~28mm, the coking coal enters the coke oven for coking production; when G<75 or Y<13.5mm, a binder is added to the coking coal until G is 75. ~90 or Y is 13.5~28mm; when G>75 or Y>28mm, continue to add lean coal until the G value of coking coal is 75~90 or the Y value is 13.5~28mm, and when the mass of lean coal is added to the maximum value of the above-mentioned limited range, if the G value is still greater than 90 or the Y value is still greater than 28mm, return to step (1) to adjust the ratio of lean coal and lean coking coal until the G value of coking coal is 75~90 or the Y value is 13.5~28mm; (3) High-temperature coking and quality inspection: Coking coal is coked to obtain coke; Testing the crush resistance strength M of coke 40 And the post-reaction strength CSR, when the M of coke 40 If the content is below 82% or the CSR is below 60%, increase the coking coal ratio until M 40 ≥82% and CSR≥60%.

[0008] Preferably, in step (1), the ash content of the blended coal is ≤11.5%, the volatile matter is ≤28%, and the sulfur content is ≤0.85%.

[0009] Preferably, in step (2), the binder includes one or more of tar pitch, petroleum pitch, and tar residue; the ash content of the binder is ≤5%, the volatile matter is ≤28%, and the moisture content is ≤12%; the leaning agent includes one or more of anthracite, coke powder, and petroleum coke; the ash content of the leaning agent is ≤13.5%, the volatile matter is ≤15%, and the moisture content is ≤2%.

[0010] Preferably, in step (2), the binder is cryogenically pulverized or atomized at high temperature and mixed evenly with the blended coal.

[0011] Preferably, in step (2), the particle size of the slimming agent is all below 3 mm, of which the portion smaller than 1 mm accounts for more than 50%.

[0012] Preferably, in step (2), the adhesive or slimming agent is added gradually from a small amount to a large amount, and the proportion added each time does not exceed 1%.

[0013] Preferably, in step (3), the coking process is as follows: the center temperature of the coking cake is 1250~1350℃, and the coking time is 19~23h.

[0014] Compared with the prior art, the present invention has the following advantages: This invention enables the reuse of carbon-containing waste, improves coke quality through coking coal blending, achieves online production control, and increases the coke's shatter resistance strength M. 40 ≥82%, post-reaction strength CSR≥60%.

[0015] This invention uses a refined active-inertia ratio range as the primary factor for coking coal blending, simplifying the coking coal blending method. When the active-inertia ratio of coking coal is within the optimal range, a small proportion of binder or leanening agent can be added appropriately to reduce the cost of coking coal blending. Then, if the G-value and Y-value meet the requirements, high-temperature coking can be carried out directly, improving the accuracy of coal blending compared to experience-based blending. When the active-inertia ratio of coking coal is not within the optimal range, the proportion of binder or leanening agent is appropriately increased until the traditional indicators of G-value and Y-value of the coking coal blend meet the requirements. If the G-value and Y-value still do not meet the requirements after adding a large proportion of binder or leanening agent, the original coal blending ratio needs to be readjusted. This invention also involves a last resort: when the quality of the produced coke does not meet the requirements, in order to achieve rapid coal blending and coking, a certain proportion of coking coal can be appropriately increased to achieve high-quality coke production. This invention provides a rapid coking coal blending method that combines continuous judgment with coal-rock blending and traditional coking coal G and Y value indicators. It eliminates the need for multiple pre-experiments in experimental coke ovens, shortens the coking coal blending time from 6-7 days to 2-3 days, and simultaneously enables the reuse of carbon-containing waste, improves coke quality, and achieves online control of industrial production.

[0016] Based on the above reasons, this invention can be widely promoted in fields such as coking coal blending. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of a method for controlling the coking coal blending in the online preparation of high-quality coke according to a specific embodiment of the present invention. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0023] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0026] like Figure 1 As shown, this invention provides a method for controlling the coking coal blending in the online preparation of high-quality coke, comprising: (1) Coal blending: The blended coal is made by mixing multiple single coals, including gas coal, gas-rich coal, coking coal, coking coal, 1 / 3 coking coal, lean coal, and lean coking coal. The proportion of gas coal or gas-rich coal is ≤25%, and the proportion of lean coal or lean coking coal is ≤25%. The blended coal has an ash content of ≤11.5%, a volatile matter content of ≤28%, and a sulfur content of ≤0.85%.

[0027] (2) Detect the active-inert ratio of the blended coal, add binders or leaning agents according to the active-inert ratio to form coking coal, detect the Gibbs freeness G value or the thickness Y value of the plastic layer of the coking coal, and further add binders or leaning agents according to the detected values; the active-inert ratio refers to the ratio of the active component to the inert component of the blended coal under a coal petrographic microscope, wherein the active component is vitrinite + 1 / 3 half vitrinite, and the inert component is filamentous group + shell group + 2 / 3 half vitrinite + minerals; the binder includes one or more of tar pitch, petroleum pitch, and tar residue; the ash content of the binder is ≤5%, volatile matter is ≤28%, and moisture is ≤12%; the leaning agent includes one or more of anthracite, coke powder, and petroleum coke; the ash content of the leaning agent is ≤13.5%, volatile matter is ≤15%, and moisture is ≤2%. The particle size of the leaning agent is all below 3mm, of which the part smaller than 1mm accounts for more than 50%. The binder is cryogenically pulverized or high-temperature atomized and mixed evenly with the blended coal. When adding binders or slimming agents, add them gradually from small amounts to large amounts, with each addition not exceeding 1%.

[0028] When the active-inert ratio is <4, a binder is added to the blended coal to obtain coking coal; specifically, when 2 ≤ active-inert ratio <4, less than 3% of the total material mass fraction of binder is added; when the active-inert ratio <2, 3%~20% of the total material mass fraction of binder is added; when G is 75~90 or Y is 13.5~28mm, the coking coal enters the coke oven for coking production; when G>90 or Y>28mm, a leanening agent is added to the coking coal until G is 7. 5~90 or Y value is 13.5~28mm; when G<75 or Y<13.5mm, continue to add binder until G is 75~90 or Y is 13.5~28mm, and when the binder mass is added to the maximum value of the above-mentioned limited range, if the G value is still less than 75 or the Y value is still less than 13.5mm, return to step (1) to adjust the blending ratio of coking coal and fat coal until the G of coking coal is 75~90 or Y is 13.5~28mm; When the active-inert ratio is ≥4, a leaning agent is added to the blended coal to obtain coking coal; specifically, when 4≤active-inert ratio≤6, a leaning agent of less than 3% of the total material mass fraction is added; when the active-inert ratio>6, a leaning agent of 3%~10% of the total material mass fraction is added; when G is 75~90 or Y is 13.5~28mm, the coking coal enters the coke oven for coking production; when G<75 or Y<13.5mm, a binder is added to the coking coal until G is 75. ~90 or Y is 13.5~28mm; when G>75 or Y>28mm, continue to add lean coal until the G value of coking coal is 75~90 or the Y value is 13.5~28mm, and when the mass of lean coal is added to the maximum value of the above-mentioned limited range, if the G value is still greater than 90 or the Y value is still greater than 28mm, return to step (1) to adjust the ratio of lean coal and lean coking coal until the G value of coking coal is 75~90 or the Y value is 13.5~28mm; (3) High-temperature coking and quality inspection: The core temperature of the coking cake is 1250~1350℃, and the coking time is 19~23h; Testing the crush resistance strength M of coke 40 And the post-reaction strength CSR, when the M of coke 40 If the content is below 82% or the CSR is below 60%, increase the coking coal ratio until M 40 ≥82% and CSR≥60%.

[0029] Example 1 like Figure 1 As shown, a method for controlling the coking coal blending in online production of high-quality coke is as follows: (1) Coal blending: Gas coal, gas-rich coal, coking coal, coking coal, 1 / 3 coking coal, lean coal, and lean coking coal are mixed in proportion to obtain blended coal. The blending ratio of each coal type is shown in Table 1. The ash content of the blended coal is 11.5%, the volatile matter is 28%, and the sulfur content is 0.85%.

[0030] Table 1 Coking Coal Blending Ratio

[0031] (2) Using a coal petrography microscope, the active-inert ratio of the blended coal was found to be 1.88. After heating the tar pitch (binder) to a liquid phase at high temperature, it was sprayed into the blended coal to obtain coking coal. The amount of sprayed powder added was gradually increased to 3% of the total material mass fraction, and mixing continued until the liquid phase of tar pitch was no longer visible to the naked eye in the mixture. The tar pitch had an ash content of 5%, a volatile content of 28%, and a moisture content of 12%. The G value of the coking coal was tested to be 92. Then, the coke powder was ground to less than 1 mm, and the ground coke powder was mixed with 1% of the total material mass fraction of coke powder (leanening agent). The coke powder had an ash content of 11.5%, a volatile content of 15%, and a moisture content of 2%. The G value was tested again to be 85, which met the furnace feed standard.

[0032] (3) High-temperature coking and quality testing. Coking coal is charged into the coke oven, the center temperature of the coke cake is 1300℃, and after coking for 21 hours, it is dry-quenched. The coke crushing strength M is then tested. 40 The content was 80%, and the CSR was 63%. The raw material was adjusted by adding 2% coking coal, and the M was tested again. 40 The CSR was 62%.

[0033] Example 2 like Figure 1 As shown, a method for controlling the coking coal blending in online production of high-quality coke is as follows: (1) Coal blending: Gas coal, gas-rich coal, coking coal, coking coal, 1 / 3 coking coal, lean coal, and lean coking coal are mixed in proportion to obtain blended coal. The blending ratio of each coal type is shown in Table 2. The ash content of the blended coal is 10.5%, the volatile matter is 26.5%, and the sulfur content is 0.75%.

[0034] Table 2 Coking Coal Blending Ratio

[0035] (2) Using a coal petrography microscope, the active-inert ratio of the blended coal was found to be 6.5. Coke powder (leanizing agent) was ground to below 100 mesh and added to the blended coal to obtain coking coal. The amount of coke powder added was gradually increased to 10% of the total material mass fraction. The coke powder had an ash content of 5%, a volatile matter content of 28%, and a moisture content of 12%. The G value of the coking coal was tested to be 74. After the tar pitch was heated to a liquid phase at high temperature, it was sprayed into the blended coal at a spraying amount of 2.5% of the total material mass fraction. Mixing continued until the liquid phase of tar pitch was no longer visible to the naked eye in the mixture. The tar pitch had an ash content of 1.0%, a volatile matter content of 25%, and a moisture content of 10%. The G value was tested again to be 75, which met the furnace entry standard.

[0036] (3) High-temperature coking and quality testing. Coking coal is charged into the coke oven, the center temperature of the coke cake is 1250℃, and after coking for 21 hours, it is dry-quenched. The crushing strength M of the coke is then tested. 40 The percentage was 84%, and the CSR was 58%. The raw material was adjusted by adding 2% coking coal, and M was tested again. 40 The CSR was 63%.

[0037] Example 3 like Figure 1 As shown, a method for controlling the coking coal blending in online production of high-quality coke is as follows: (1) Coal blending: Gas coal, gas-rich coal, coking coal, coking coal, 1 / 3 coking coal, lean coal, and lean coking coal are mixed in proportion to obtain blended coal. The blending ratio of each coal type is shown in Table 3. The blended coal has an ash content of 10.5%, a volatile matter content of 26.5%, and a sulfur content of 0.75%.

[0038] Table 3 Coking Coal Blending Ratio

[0039] (2) Using a coal petrography microscope, the active-inert ratio of the blended coal was found to be 1.5. After the tar pitch was heated to a liquid phase at high temperature, it was sprayed into the blended coal, and the amount of sprayed pitch added was gradually increased to 20% of the total material mass fraction. Mixing continued until the liquid phase of tar pitch was no longer visible to the naked eye in the mixture. The ash content of the tar pitch was 1.0%, the volatile matter was 25%, and the moisture content was 10%. The G value of the coking coal after the mixing was found to be 74 < 75. The ratio of fat coal and coking coal was readjusted as shown in Table 4.

[0040] Table 4 Coking Coal Blending Ratio

[0041] The active-inert ratio of the blended coal was determined to be 2.0 using a coal petrography microscope. After the tar pitch was heated to a liquid phase at high temperature, it was sprayed into the blended coal, gradually increasing the amount added to 2.5% of the total material mass. Mixing continued until no liquid tar pitch was visible to the naked eye in the mixture. The tar pitch had an ash content of 1.0%, a volatile matter content of 25%, and a moisture content of 10%. The G-value of the blended coking coal was tested again and found to be 79, meeting the standard of a G-value of 75-90 or a Y-value of 13.5-28mm for coal entering the furnace.

[0042] (3) High-temperature coking and quality testing. Coking coal is charged into the coke oven, the center temperature of the coke cake is 1250℃, and after coking for 23 hours, it is dry-quenched. The crushing strength M of the coke is then tested. 40 The CSR was 65%.

[0043] Example 4 like Figure 1 As shown, a method for controlling the coking coal blending in online production of high-quality coke is as follows: (1) Coal blending: Gas coal, gas-rich coal, coking coal, coking coal, 1 / 3 coking coal, lean coal, and lean coking coal are mixed in proportion to obtain blended coal. The blending ratios of each coal type are shown in Table 5. The ash content of the blended coal is 11.5%, the volatile matter is 26.5%, and the sulfur content is 0.8%.

[0044] Table 5 Coking Coal Blending Ratio

[0045] (2) Using a coal petrography microscope, the active-inert ratio of the blended coal was found to be 7. Coke powder (leanizing agent) was ground to <1mm and accounted for 80%, and added to the blended coal. The amount of coke powder added was gradually increased to 10% of the total material mass fraction. The ash content of the coke powder was 5%, the volatile matter was 28%, and the moisture content was 12%. After the mixing steps, the Y value of the coking coal was found to be 30mm > 28mm. The ratio of lean coal and lean coking coal was readjusted, as shown in Table 6.

[0046] Table 6 Coking Coal Blending Ratio

[0047] The active-inert ratio of the blended coal was determined to be 4.0 using a coal petrography microscope. Coke powder (leanening agent) was ground to <1mm and comprised 80% of the powder. This coke powder was then added to the blended coal, with the amount gradually increased to 2.0% of the total material mass fraction during mixing. The coke powder had an ash content of 5%, a volatile matter content of 28%, and a moisture content of 5%. After mixing, the Y-value of the coking coal was 18mm, meeting the furnace feed standard.

[0048] (3) High-temperature coking and quality testing. Coking coal was charged into the coke oven, the center temperature of the coke cake was 1350℃, and after coking for 19 hours, it was dry-quenched. The coke crushing strength M was then tested. 40 The yield was 84%, and the CSR was 58%. The raw material was adjusted by adding 1.5% coking coal, and the M value was tested again.40 The CSR was 63%.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the coking coal blending in online production of high-quality coke, characterized in that, include: (1) Coal blending: A blended coal is formed by mixing multiple single coal types, including gas coal, gas-fat coal, coking coal, fat coal, 1 / 3 coking coal, lean coal, and lean coking coal, wherein the proportion of gas coal or gas-fat coal is ≤25% and the proportion of lean coal or lean coking coal is ≤25%. (2) Detect the active-inert ratio of the blended coal, add binder or leaning agent according to the active-inert ratio to form coking coal, detect the thickness Y value of the plastic layer of the coking coal, and add binder or leaning agent according to the detected value; When the active-inert ratio is <4, a binder is added to the blended coal to obtain coking coal; wherein, when 2≤active-inert ratio<4, a binder accounting for less than 3% of the total material mass fraction is added; when the active-inert ratio is <2, a binder accounting for 3%~20% of the total material mass fraction is added; when the Y value is 13.5~28mm, the coking coal enters the coke oven for coking production; when Y>28mm, a leaning agent is added to the coking coal until the Y value is 13.5~28mm; when Y<13.5mm, the binder is added until Y is 13.5~28mm, and when the binder mass is added to the maximum value of the above-mentioned limited range, the Y value is still less than 13.5mm, return to step (1) to adjust the blending ratio of coking coal and fat coal until the Y of the coking coal is 13.5~28mm; When the active-inert ratio is ≥4, a lean coal sizing agent is added to the blended coal to obtain coking coal; wherein, when 4≤active-inert ratio≤6, a lean coal sizing agent accounting for less than 3% of the total material mass fraction is added; when the active-inert ratio>6, a lean coal sizing agent accounting for 3%~10% of the total material mass fraction is added; when Y is 13.5~28mm, the coking coal enters the coke oven for coking production; when Y<13.5mm, a binder is added to the coking coal until Y is 13.5~28mm; when Y>28mm, a lean coal sizing agent is added until the Y value of the coking coal is 13.5~28mm, and when the lean coal sizing agent mass is added to the maximum value of the above-mentioned limited range, the Y value is still greater than 28mm, return to step (1) to adjust the blending ratio of lean coal and lean coking coal until the Y value of the coking coal is 13.5~28mm; (3) High-temperature coking and quality inspection: Coking coal is coked to obtain coke; Detecting coke crush strength M 40 and post-reaction strength CSR, when coke's M 40 below 82% or CSR below 60%, increase the proportion of coking coal until M 40 ≥ 82% and CSR ≥ 60%.

2. The method for controlling coking coal blending in online preparation of high-quality coke according to claim 1, characterized in that, In step (1), the ash content of the blended coal is ≤11.5%, the volatile matter is ≤28%, and the sulfur content is ≤0.85%.

3. The method for controlling the coking coal blending in online preparation of high-quality coke according to claim 1, characterized in that, In step (2), the binder includes one or more of tar pitch, petroleum pitch, and tar residue; the ash content of the binder is ≤5%, the volatile matter is ≤28%, and the moisture content is ≤12%; the leaning agent includes one or more of anthracite, coke powder, and petroleum coke; the ash content of the leaning agent is ≤13.5%, the volatile matter is ≤15%, and the moisture content is ≤2%.

4. The method for controlling coking coal blending in online preparation of high-quality coke according to claim 1, characterized in that, In step (2), the binder is cryogenically pulverized or atomized at high temperature and mixed evenly with the blended coal.

5. The method for controlling coking coal blending in online preparation of high-quality coke according to claim 1, characterized in that, In step (2), the particle size of the slimming agent is all below 3 mm, of which the portion smaller than 1 mm accounts for more than 50%.

6. The method for controlling coking coal blending in online preparation of high-quality coke according to claim 1, characterized in that, In step (2), the adhesive or slimming agent is added gradually from a small amount to a large amount, and the proportion added each time does not exceed 1%.

7. The method for controlling coking coal blending in online preparation of high-quality coke according to claim 1, characterized in that, In step (3), the coking process is as follows: the coking cake center temperature is 1250~1350℃, and the coking time is 19~23h.

Images